Sian Ka'an
Country
Mexico
Inscribed in
1987
Criteria
(vii)
(x)
The conservation outlook for this site has been assessed as "significant concern" in the latest assessment cycle. Explore the Conservation Outlook Assessment for the site below. You have the option to access the summary, or the detailed assessment.
In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means 'Origin of the Sky'. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. © UNESCO
Summary
2025 Conservation Outlook
Finalised on
11 Oct 2025
Significant concern
Current state and trend of VALUES
High Concern
Overall THREATS
Overall PROTECTION and MANAGEMENT
Full assessment
Description of values
Scenic mosaic of landscape elements and the relatively undisturbed interface of land and sea along a well-conserved coastline
Criterion
(vii)
The aesthetics and beauty of Sian Ka'an derive from the relatively undisturbed interface of sea, forest and land along a comparatively well-conserved coastline. The mosaic of landscape elements generated by the interaction of nine ecosystems is diverse in shapes, forms and colours allowing intriguing views and impressions. Noteworthy and rare natural phenomena include the "Cenotes", water-filled natural sinkholes hosting specialised communities of life and the "Petenes", tree islands emerging from the swamps. Both are connected by underground freshwater systems, jointly forming an invaluable and fragile treasure for future generations (World Heritage Committee, 2013).
Diversity of ecosystems and range of terrestrial and aquatic life forms
Criterion
(x)
The scale and conservation status of Sian Ka'an and its ecosystem diversity, including 17 different vegetation types, support a fascinating range of life forms. The main vegetation types include medium and lowland rainforests, mangroves, savannas, and coastal dunes besides two marine ecosystems—seagrass beds and coral reefs. These habitats are home to the 4,091 species documented to date: 1,015 plants, 361 fish, 20 amphibians, 72 reptiles, 373 birds, 115 mammals, 1,725 invertebrates, 90 fungi, and 320 protists-algae (CONANP, 2025). A total of 1,426 plant species have been recorded; the aquatic flora includes 94 species of vascular plants and 304 species of benthic macroalgae, in addition to fungi, ferns, and other species of interest (CONANP, 2014).
In the interface zones between the sea and the jungle, it is easy to observe vast expanses of wetlands designated as RAMSAR sites, where two unique ecosystems predominate: mangroves (red, white, black, and buttonwood) and the savannas with their characteristic petenes. Both are protected under Mexican law and are irrigated by the Great Mayan Aquifer (the largest underground river in the world). In these areas, many of the 407 bird species recorded in the reserve can be observed, including the osprey, roseate spoonbills, wood storks, countless warblers, and the white ibis, in addition to the striking terns (CONANP, 2014).
The fauna of Sian Ka'an is characterized by its great diversity, with 2,638 documented species, ranging from rodents to mammals. Among the mammals, five species of neotropical felines stand out, such as the jaguar and puma (CONANP, 2014; Ceballos et al., 2021), in addition to other emblematic animals such as endangered species like Black-handed Spider Monkey, Yucatan Black Howler Monkey and the Central American Tapir. A small population of the vulnerable West Indian Manatee occurs in the coastal waters (Navarro et al., 1990; CONANP, 2014; Aguilera Miranda, 2023). There are also 373 bird species recorded, many of them aquatic and migratory. The herpetofauna includes 65 species of reptiles and 20 species of amphibians, such as sea turtles and crocodiles (CONANP, 2014; Aguilar-López et al., 2020, 2021). The isolation of some of the "Cenotes" led to the evolution of several species, which are locally endemic to single sinkholes, such as blind fish and microscopic invertebrates, including rotifers, cladocerans, and copepods—among them Remaneicaris siankan and Mastigodiaptomus siankaanensis sp. (CONANP, 2025). With 87 recorded species of reef-building coral, the portion of the Mesoamerican Reef within the site is one of the richest in Mexico. Jointly with the many other aquatic habitats, it harbours more than 400 species of fish and a wealth of other marine life (World Heritage Committee, 2013). These include barracuda, tarpon and bass, which are important for recreational and subsistence fishing. Freshwater ichthyofauna are also of special relevance, as they respond quickly to environmental changes, with pioneer species surviving in extreme conditions (CONANP, 2014; Valdez-Moreno et al., 2021; Vázquez-Ramos et al., 2023).
In the interface zones between the sea and the jungle, it is easy to observe vast expanses of wetlands designated as RAMSAR sites, where two unique ecosystems predominate: mangroves (red, white, black, and buttonwood) and the savannas with their characteristic petenes. Both are protected under Mexican law and are irrigated by the Great Mayan Aquifer (the largest underground river in the world). In these areas, many of the 407 bird species recorded in the reserve can be observed, including the osprey, roseate spoonbills, wood storks, countless warblers, and the white ibis, in addition to the striking terns (CONANP, 2014).
The fauna of Sian Ka'an is characterized by its great diversity, with 2,638 documented species, ranging from rodents to mammals. Among the mammals, five species of neotropical felines stand out, such as the jaguar and puma (CONANP, 2014; Ceballos et al., 2021), in addition to other emblematic animals such as endangered species like Black-handed Spider Monkey, Yucatan Black Howler Monkey and the Central American Tapir. A small population of the vulnerable West Indian Manatee occurs in the coastal waters (Navarro et al., 1990; CONANP, 2014; Aguilera Miranda, 2023). There are also 373 bird species recorded, many of them aquatic and migratory. The herpetofauna includes 65 species of reptiles and 20 species of amphibians, such as sea turtles and crocodiles (CONANP, 2014; Aguilar-López et al., 2020, 2021). The isolation of some of the "Cenotes" led to the evolution of several species, which are locally endemic to single sinkholes, such as blind fish and microscopic invertebrates, including rotifers, cladocerans, and copepods—among them Remaneicaris siankan and Mastigodiaptomus siankaanensis sp. (CONANP, 2025). With 87 recorded species of reef-building coral, the portion of the Mesoamerican Reef within the site is one of the richest in Mexico. Jointly with the many other aquatic habitats, it harbours more than 400 species of fish and a wealth of other marine life (World Heritage Committee, 2013). These include barracuda, tarpon and bass, which are important for recreational and subsistence fishing. Freshwater ichthyofauna are also of special relevance, as they respond quickly to environmental changes, with pioneer species surviving in extreme conditions (CONANP, 2014; Valdez-Moreno et al., 2021; Vázquez-Ramos et al., 2023).
Integral component of the system of mangroves, seagrass beds and coral reefs of Mesoamerica
It deserves to be noted that Sian Ka'an belongs to a UNESCO Biosphere Reserve providing protection to an important and relatively intact 120-kilometer section of the Mesoamerican Reef, a marine area of global conservation significance. It is functionally and ecologically linked with the coastal mangroves and the seagrass beds. Taken together, coral reef, seagrass and mangrove ecosystems provide supporting, regulating, provisioning, and cultural ecosystem services.
Reef-building corals create solid adjacent structures that serve as refuge, food source, or substrate for other species—either temporarily or permanently—thereby supporting multiple fisheries and tourism activities. Their growth alters the physical and ecological characteristics of their environment.
Seagrass beds provide biomass that supports the base of trophic chains; species such as turtles, crustaceans, and fish feed on them. These habitats also host multiple seagrass species due to their ideal reproductive conditions (Cepeda-González, 2007).
Sian Ka’an contains four types of mangroves: red (Rhizophora mangle), black (Avicennia germinans), white (Laguncularia racemosa), and buttonwood (Conocarpus erectus). These provide support for 90% of commercially important fish species, as they serve as nursery areas and shelter a significant number of birds year-round. They are also ideal ecosystems for tourism activities. Additionally, these extensive areas act as natural filters for runoff from the upper watershed of the peninsula, allowing water from the interior to reach the reef in improved quality (Cepeda-González, 2007; CONANP, 2014).
These ecosystems are interlinked through complex formations, allowing them to support high biodiversity as a whole. In addition, they substantially reduce wave impact energy, decreasing flood levels and sediment loss, protecting the coast more effectively than any habitat alone. Corals and seagrasses help mitigate the risk of coastal erosion, promoting stability outside mangroves and reducing near-shore currents, which increases the resistance of coastal regions to the effects of climate change, i.e. their resilience. These ecosystems are also important carbon sinks, contributing significantly to climate change mitigation (IUCN consultation, 2024, 2025).
Reef-building corals create solid adjacent structures that serve as refuge, food source, or substrate for other species—either temporarily or permanently—thereby supporting multiple fisheries and tourism activities. Their growth alters the physical and ecological characteristics of their environment.
Seagrass beds provide biomass that supports the base of trophic chains; species such as turtles, crustaceans, and fish feed on them. These habitats also host multiple seagrass species due to their ideal reproductive conditions (Cepeda-González, 2007).
Sian Ka’an contains four types of mangroves: red (Rhizophora mangle), black (Avicennia germinans), white (Laguncularia racemosa), and buttonwood (Conocarpus erectus). These provide support for 90% of commercially important fish species, as they serve as nursery areas and shelter a significant number of birds year-round. They are also ideal ecosystems for tourism activities. Additionally, these extensive areas act as natural filters for runoff from the upper watershed of the peninsula, allowing water from the interior to reach the reef in improved quality (Cepeda-González, 2007; CONANP, 2014).
These ecosystems are interlinked through complex formations, allowing them to support high biodiversity as a whole. In addition, they substantially reduce wave impact energy, decreasing flood levels and sediment loss, protecting the coast more effectively than any habitat alone. Corals and seagrasses help mitigate the risk of coastal erosion, promoting stability outside mangroves and reducing near-shore currents, which increases the resistance of coastal regions to the effects of climate change, i.e. their resilience. These ecosystems are also important carbon sinks, contributing significantly to climate change mitigation (IUCN consultation, 2024, 2025).
Ecological connectivity
In Sian Ka’an, two interconnected environmental complexes converge in the region, referred to as: 1) Jungle–Caribbean (Sian Ka’an, Sian Ka’an Reefs, Banco Chinchorro, Xcalak, and the Mexican Caribbean) ; 2) Maya Forest (Sian Ka’an, Bala’an K’aax, Calakmul, Balam Kin, and Balam Ku).
These complexes integrate various corridors and regional connectivity strategies.
In the Jungle–Caribbean Complex, Sian Ka’an plays a key role as one of the cornerstones of the region. Its strategic location in the heart of the Quintana Roo coastline has allowed it to maintain marine ecosystems in a good state of conservation. This complex also includes the Sian Ka’an Reefs Biosphere Reserve, the Banco Chinchorro Biosphere Reserve, and the Xcalak Reefs National Park. It has been further strengthened by the creation of the Mexican Caribbean Biosphere Reserve, which encompasses these protected areas and fosters a mosaic of protection across the entire Mexican Caribbean. Within this complex, these protected areas share a major natural corridor of high biodiversity and economic importance for the entire region—the Mesoamerican Reef System. For example, Sian Ka'an area is an important biological corridor for bird species. Mangroves play a functional role in connecting with other ecosystems such as seagrasses, low flood forests and coral reefs. This natural ecological connectivity between ecosystems allows them to maintain their resilience (Olds et al., 2012; Gillis et al., 2017; Mishra et al., 2020). This system forms the backbone of local livelihoods along approximately 300 km of the Mexican section of the Mesoamerican Reef System (MAR).
In the Maya Forest Complex, Sian Ka’an shares corridors with the Calakmul Biosphere Reserve and the Bala’an K’aax Flora and Fauna Protection Area, which together form the Calakmul–Sian Ka’an Biological Corridor. This corridor has recently expanded toward the Escárcega region in the state of Campeche, as the Balam Kin and Balam Ku areas have become federally designated Protected Natural Areas. This region safeguards the second-largest forest mass in Latin America and a unique biocultural landscape.
The conservation and management of these interconnected ecosystems can increase the resilience of both ecosystems and individual species (IUCN Consultation, 2024).
These complexes integrate various corridors and regional connectivity strategies.
In the Jungle–Caribbean Complex, Sian Ka’an plays a key role as one of the cornerstones of the region. Its strategic location in the heart of the Quintana Roo coastline has allowed it to maintain marine ecosystems in a good state of conservation. This complex also includes the Sian Ka’an Reefs Biosphere Reserve, the Banco Chinchorro Biosphere Reserve, and the Xcalak Reefs National Park. It has been further strengthened by the creation of the Mexican Caribbean Biosphere Reserve, which encompasses these protected areas and fosters a mosaic of protection across the entire Mexican Caribbean. Within this complex, these protected areas share a major natural corridor of high biodiversity and economic importance for the entire region—the Mesoamerican Reef System. For example, Sian Ka'an area is an important biological corridor for bird species. Mangroves play a functional role in connecting with other ecosystems such as seagrasses, low flood forests and coral reefs. This natural ecological connectivity between ecosystems allows them to maintain their resilience (Olds et al., 2012; Gillis et al., 2017; Mishra et al., 2020). This system forms the backbone of local livelihoods along approximately 300 km of the Mexican section of the Mesoamerican Reef System (MAR).
In the Maya Forest Complex, Sian Ka’an shares corridors with the Calakmul Biosphere Reserve and the Bala’an K’aax Flora and Fauna Protection Area, which together form the Calakmul–Sian Ka’an Biological Corridor. This corridor has recently expanded toward the Escárcega region in the state of Campeche, as the Balam Kin and Balam Ku areas have become federally designated Protected Natural Areas. This region safeguards the second-largest forest mass in Latin America and a unique biocultural landscape.
The conservation and management of these interconnected ecosystems can increase the resilience of both ecosystems and individual species (IUCN Consultation, 2024).
Hydrological system
The Sian Ka'an Complex has an underground water system that interconnects cenotes and petenes and is unique in the Peninsula of Yucatan and in the world (CONANP, 2014). The Sian Ka'an Biosphere Reserve is part of the hydrological complex of lagoons, wetlands, underground rivers and cenotes that converge with the Mesoamerican Reef System (Audefroy, 2022). Sian Ka'an receives significant contributions of fresh water, dominated by sulphates and calcium, which influence the water chemistry in estuary and wetland areas. In addition, groundwater discharges, especially in petenes areas (vegetation islands), have been found to contribute significantly to the availability of nutrients, such as phosphorus, triggering the productivity of these ecosystems (Lagomasino et al., 2015).
Assessment information
The greatest current threats to the property are related to direct and indirect impacts of tourism growth and recreational use in the surrounding area, particularly along Cancun-Tulum tourist corridor immediately to the north of Sian Ka'an. These impacts include erosion of coastal ecosystems, habitat fragmentation, increased pollution, and inappropriate use of natural resources, both terrestrial and marine. Furthermore, the depletion of freshwater aquifers, together with inadequate wastewater management and waste management, is equally concerning.
On land, illegal hunting and poaching by local residents has led to increases in intentional and accidental forest fires that particularly affect savannah and forested areas. In the marine areas, the combination of overexploitation of several species, the introduction of invasive alien species, destructive fishing practices, land-based and marine pollution, and worrying trends in the Mesoamerican Reef in terms of bleaching and acidification have altered the ecosystem and are likely to cause further damage if not addressed. Climate change is already affecting marine ecosystems through increased ocean temperatures, sea level rise, and the increased frequency and intensity of hurricanes and tropical storms. Finally, the issue of massive sargassum algae is causing impacts to coastal species and contributing to erosion, while also producing unfavourable conditions for tourism activity. The combination and cumulation of these threats, particularly in light of new major air and rail infrastructure projects planned in the immediate vicinity of the property that will serve to facilitate even greater tourist activity in the region, are evident of very high pressures on the ecosystem integrity of Sian Ka'an.
On land, illegal hunting and poaching by local residents has led to increases in intentional and accidental forest fires that particularly affect savannah and forested areas. In the marine areas, the combination of overexploitation of several species, the introduction of invasive alien species, destructive fishing practices, land-based and marine pollution, and worrying trends in the Mesoamerican Reef in terms of bleaching and acidification have altered the ecosystem and are likely to cause further damage if not addressed. Climate change is already affecting marine ecosystems through increased ocean temperatures, sea level rise, and the increased frequency and intensity of hurricanes and tropical storms. Finally, the issue of massive sargassum algae is causing impacts to coastal species and contributing to erosion, while also producing unfavourable conditions for tourism activity. The combination and cumulation of these threats, particularly in light of new major air and rail infrastructure projects planned in the immediate vicinity of the property that will serve to facilitate even greater tourist activity in the region, are evident of very high pressures on the ecosystem integrity of Sian Ka'an.
Fishing, Harvesting & Controlling Aquatic Species
(Overfishing )
Other targeted species names
Spiny lobster (Panulirus argus); queen conch (Lobatus gigas)
Inside site
, Throughout(>50%)
Outside site
In Sian Ka’an, unsustainable fishing gear such as gillnets, trap nets for finfish, and hooks for lobster capture have been phased out (Guzmán Escalante, 2019). However, illegal fishing persists in several focal areas within the World Heritage site, primarily affecting lobster, queen conch, and grouper fisheries (IUCN consultation 2024, 2025). These species are marketed in Mahahual, Chetumal, and towns near the protected area (Monitoring and Surveillance Reports, CONANP 2024).
Overfishing is well documented in the entire reef and aggravated by competition with and predation from the invasive lionfish (Healthy Reefs for Healthy People, 2012). Despite encouraging management improvements, the high demand for spiny lobster puts major pressure on this species. Illegal, unreported and unregulated (IUU) fishing and the lack of effective law enforcement remains as a major challenge. Both fishermen and managers consider that illegal fishing and the lack of law enforcement to be the greatest challenges facing in this site and all protected areas in the region (Ayer et al., 2018). A declining budget has weakened the National Commission for Fisheries and Aquaculture (CONAPESCA)’s law enforcement capabilities. Similarly, the National Commission for Natural Protected Areas (CONANP) lacks the authority to detain poachers or confiscate equipment (Ayer et al., 2018). Furthermore, CONANP’s budget was also reduced in 2019 and 2020, further affecting its capabilities (IUCN Consultation, 2020).
Overfishing is well documented in the entire reef and aggravated by competition with and predation from the invasive lionfish (Healthy Reefs for Healthy People, 2012). Despite encouraging management improvements, the high demand for spiny lobster puts major pressure on this species. Illegal, unreported and unregulated (IUU) fishing and the lack of effective law enforcement remains as a major challenge. Both fishermen and managers consider that illegal fishing and the lack of law enforcement to be the greatest challenges facing in this site and all protected areas in the region (Ayer et al., 2018). A declining budget has weakened the National Commission for Fisheries and Aquaculture (CONAPESCA)’s law enforcement capabilities. Similarly, the National Commission for Natural Protected Areas (CONANP) lacks the authority to detain poachers or confiscate equipment (Ayer et al., 2018). Furthermore, CONANP’s budget was also reduced in 2019 and 2020, further affecting its capabilities (IUCN Consultation, 2020).
Water-borne & other effluent Pollution, Garbage & Solid Waste
(Marine pollution and garbage)
Inside site
, Throughout(>50%)
Outside site
The exponential development of urban infrastructure and tourism in the area of influence is causing damage to the underground aquifer system, including the presence of pathogenic microorganisms confirmed by recent studies, due to inadequate disposal of wastewater (State Party of Mexico, 2023). High levels of chemicals and heavy metals have been detected in the coastal marine environment and brackish water wetlands. It has been estimated that the arrival of solid waste to the beaches of Sian Ka'an is 2.5 tons of solid waste per linear kilometer, with plastic waste contributing the largest volume, and the waste is estimated as coming from 45 countries (State Party of Mexico, 2023).
80% of the waste accumulated on the coast, particularly plastics, comes from recreational and fishing activities, due to poor and inadequate practices, although they also seem to originate from remote sources (Hernández et al., 2022). Rapid urbanization and high rates of tourism growth in the region have led to deteriorated water quality, mainly due to the discharge of nutrients from non-treated wastewater, which negatively impacts coastal ecosystems (IUCN Consultation, 2024).
In Sian Ka'an, mangroves and wetlands depends heavily on groundwater flow, which is affected by the infiltration of wastewater, altering the dynamics of these sensitive ecosystems. This contamination leads to the proliferation of macroalgae, which compete with corals and other marine organisms, affecting biodiversity and the reef’s health (Suchley and Álvarez-Filip, 2018). Coastal dredging, construction and marine ports contribute sedimentation and pollution locally, while coastal development and urbanization has resulted in wide scale eutrophication of coastal waters across the Mexican Caribbean (Suchley and Alvarez‐Filip, 2018).
80% of the waste accumulated on the coast, particularly plastics, comes from recreational and fishing activities, due to poor and inadequate practices, although they also seem to originate from remote sources (Hernández et al., 2022). Rapid urbanization and high rates of tourism growth in the region have led to deteriorated water quality, mainly due to the discharge of nutrients from non-treated wastewater, which negatively impacts coastal ecosystems (IUCN Consultation, 2024).
In Sian Ka'an, mangroves and wetlands depends heavily on groundwater flow, which is affected by the infiltration of wastewater, altering the dynamics of these sensitive ecosystems. This contamination leads to the proliferation of macroalgae, which compete with corals and other marine organisms, affecting biodiversity and the reef’s health (Suchley and Álvarez-Filip, 2018). Coastal dredging, construction and marine ports contribute sedimentation and pollution locally, while coastal development and urbanization has resulted in wide scale eutrophication of coastal waters across the Mexican Caribbean (Suchley and Alvarez‐Filip, 2018).
Invasive Non-Native/ Alien Species
(Invasive alien species)
Invasive/problematic species
Pterois volitans
Casuarina equisetifolia
Other invasive species names
Red mite (Dermanyssus gallinae); Vine weevil (Otiorhynchus sp)
Inside site
, Extent of threat not known
Outside site
The most recent report indicates the presence of 82 invasive alien species within the property, of which 41 are alien, 26 are invasive alien species, 7 are native species with invasive behavior, and 8 are invasive alien species with potential for introduction (State Party of Mexico, 2023). Sian Ka’an has an Early Detection Protocol for Invasive Alien Species. In addition, a program has been implemented for the early and rapid detection of aquatic invasive species using DNA barcoding and environmental DNA analysis.
Invasive alien species, both marine and terrestrial, pose a threat to local biodiversity by altering sensitive ecosystems such as coral reefs and mangroves. For example, the lionfish (Pterois volitans) has invaded reefs, preying on native species and impacting local fisheries (Quintana et al., 2023). Similarly, invasive plants such as the Australian pine (Casuarina equisetifolia) are modifying coastal ecosystems by displacing native vegetation in coastal dune systems (CONANP, 2014).
However, control and eradication programs exist only for casuarina, the red mite, lionfish, black weevil, mistletoe, and Taiwan grass. These measures have proven insufficient, and efforts must be intensified to more effectively combat invasive species (IUCN Consultation, 2024).
Invasive alien species, both marine and terrestrial, pose a threat to local biodiversity by altering sensitive ecosystems such as coral reefs and mangroves. For example, the lionfish (Pterois volitans) has invaded reefs, preying on native species and impacting local fisheries (Quintana et al., 2023). Similarly, invasive plants such as the Australian pine (Casuarina equisetifolia) are modifying coastal ecosystems by displacing native vegetation in coastal dune systems (CONANP, 2014).
However, control and eradication programs exist only for casuarina, the red mite, lionfish, black weevil, mistletoe, and Taiwan grass. These measures have proven insufficient, and efforts must be intensified to more effectively combat invasive species (IUCN Consultation, 2024).
Commercial & Industrial Areas, Recreation & Tourism Areas
(Inappropriate tourism and urban development)
Inside site
, Extent of threat not known
Outside site
The rapid expansion of tourism and the development of mass transportation infrastructure in the surrounding region, and especially along the Cancun-Tulum coastal corridor, have led to a series of negative impacts, such as increased habitat fragmentation, interruption of species genetic flow, increased demand for resources, and changes in land use (CONANP, 2014; Lagomasino et al., 2015). The development of urban and hotel infrastructure in the municipality of Tulum has been increasing exponentially in the last 10 years, without adequate development planning for the tropical forest, wetlands, mangrove, underground rivers and coral reef ecosystems, that exist in the buffer zone of the property (State Party of Mexico, 2023). In particular, the lack of adequate regulations to control tourism activities in sensitive areas has aggravated these problems, affecting the long-term sustainability of the reserve's ecosystems (Merediz-Alonso et al., 2020). Mass tourism developments, major tourist attractions and associated coastal urbanisation have brought well-documented water, garbage and sewage problems, and require monitoring and management responses. The tourism development as well as the population growth of this area has also caused an increase in the extraction of water from underground rivers (State Party of Mexico, 2023). The water demands outstrip the capacity of the freshwater aquifer, thereby causing its depletion and affecting the delicate water composition of the coastal lagoons (Con Pro, 2011; CONANP, 2007).
Negative impacts from housing construction, commercial development, and major visitor accommodations and associated infrastructure, as well as ground, underground, and air transportation infrastructure outside the site associated with tourism growth are all reported as increasing (State Party of Mexico, 2023). In recent years the size of the roads around the site has increased, causing connectivity of the ecosystems to be lost, the landscape is affected; with the continuously increasing traffic, there is a large amount of fauna (mammals and birds) that are run over by the vehicles (State Party of Mexico, 2023). The development of the Carrillo Puerto Highway “Puerta del Mar” to get to the coast and its potential consequences of increased and unplanned development are a major threat, especially when crossing through wetlands in Sian Ka’an (IUCN Consultation, 2025).
There are government-supported projects for the construction of a commercial and military airport in the zone of influence of Sian Ka'an, less than two kilometers away from the boundaries of the World Heritage property, in addition to the construction of a tourist and cargo train (the "Tren Maya" project) that will be located along the entire boundaries of the property. These large infrastructure projects are expected to bring negative impacts on the connectivity of the ecosystems that make up Sian Ka'an, impact populations of birds, mammals, and other biodiversity, and put additional pressure on the underground aquifer (State Party of Mexico, 2023). An analysis of satellite images of the area shows that by June 2023 there were 10,831 hectares (26,764 acres) being used in some way for the Maya Train, with 61% of that area deforested (Durán, 2023). The area deforested for the Maya Train works, 4,139 hectares (10,228 acres) were lowland and medium rainforest; 2,246 hectares (5,550 acres) were medium deciduous forest; 70 hectares (173 acres) were mangrove and péten (the name given in the Yucatán Peninsula to islands of arboreal vegetation found in flood zones); and 11.4 hectares (28 acres) were medium and high evergreen forest (Durán, 2023).
Negative impacts from housing construction, commercial development, and major visitor accommodations and associated infrastructure, as well as ground, underground, and air transportation infrastructure outside the site associated with tourism growth are all reported as increasing (State Party of Mexico, 2023). In recent years the size of the roads around the site has increased, causing connectivity of the ecosystems to be lost, the landscape is affected; with the continuously increasing traffic, there is a large amount of fauna (mammals and birds) that are run over by the vehicles (State Party of Mexico, 2023). The development of the Carrillo Puerto Highway “Puerta del Mar” to get to the coast and its potential consequences of increased and unplanned development are a major threat, especially when crossing through wetlands in Sian Ka’an (IUCN Consultation, 2025).
There are government-supported projects for the construction of a commercial and military airport in the zone of influence of Sian Ka'an, less than two kilometers away from the boundaries of the World Heritage property, in addition to the construction of a tourist and cargo train (the "Tren Maya" project) that will be located along the entire boundaries of the property. These large infrastructure projects are expected to bring negative impacts on the connectivity of the ecosystems that make up Sian Ka'an, impact populations of birds, mammals, and other biodiversity, and put additional pressure on the underground aquifer (State Party of Mexico, 2023). An analysis of satellite images of the area shows that by June 2023 there were 10,831 hectares (26,764 acres) being used in some way for the Maya Train, with 61% of that area deforested (Durán, 2023). The area deforested for the Maya Train works, 4,139 hectares (10,228 acres) were lowland and medium rainforest; 2,246 hectares (5,550 acres) were medium deciduous forest; 70 hectares (173 acres) were mangrove and péten (the name given in the Yucatán Peninsula to islands of arboreal vegetation found in flood zones); and 11.4 hectares (28 acres) were medium and high evergreen forest (Durán, 2023).
Unknown Threats
(Loss of architectural complexity of coral reefs)
Inside site
, Throughout(>50%)
Outside site
The loss of reef architectural complexity may lead to the loss of the natural coastal protection provided by reefs. The vulnerability of the coast to an increase in the intensity of storms and sea level, will likely be compounded by the reduced wave dissipation function of architecturally simpler reefs (Rioja-Nieto et al., 2018). In addition, a negative impact is expected on fisheries and a loss of scenic beauty in the ecotourism activities carried out in this environment (IUCN consultation, 2025).
Water-borne & other effluent Pollution
(Groundwater pollution)
Inside site
, Extent of threat not known
Outside site
One of the main threats to the conservation of the property is groundwater pollution in this karstic region (Rioja-Nieto et al., 2018). The coastal aquifer is highly vulnerable to contamination, and connects with the sea. Sewage systems are limited, and local regulations establish that human settlements should have septic wells to inject the sewage into the ground. Several studies have established a strong connectivity and a high mixing with the aquifer.
Freshwater resources are becoming contaminated with ever increasing amounts of untreated wastewater (Secaira and Acevedo, 2017). Groundwater pollution is mainly associated with urban areas, agriculture, and roads. Compounds that commonly contaminate these waters include heavy metals, polycyclic aromatic hydrocarbons, fertilizers, pesticides, and organic matter (IUCN Consultation, 2024). Improper disposal of sargassum waste can also affect water quality in the underground cave system (Gómez et al., 2022). Chávez et al. (2020) noted that leachates from poorly managed sargassum on land are likely to reach groundwater due to high soil permeability.
Furthermore, some cenotes, which are popular tourist attractions, receive a large number of visitors, leading to local water pollution (e.g., sunscreen residues and improper solid waste management) (Casas-Beltrán et al., 2020). This is especially relevant, given that underground caves are home to many endemic species.
Freshwater resources are becoming contaminated with ever increasing amounts of untreated wastewater (Secaira and Acevedo, 2017). Groundwater pollution is mainly associated with urban areas, agriculture, and roads. Compounds that commonly contaminate these waters include heavy metals, polycyclic aromatic hydrocarbons, fertilizers, pesticides, and organic matter (IUCN Consultation, 2024). Improper disposal of sargassum waste can also affect water quality in the underground cave system (Gómez et al., 2022). Chávez et al. (2020) noted that leachates from poorly managed sargassum on land are likely to reach groundwater due to high soil permeability.
Furthermore, some cenotes, which are popular tourist attractions, receive a large number of visitors, leading to local water pollution (e.g., sunscreen residues and improper solid waste management) (Casas-Beltrán et al., 2020). This is especially relevant, given that underground caves are home to many endemic species.
Hunting, Collecting & Controlling Terrestrial Animals, Gathering, Harvesting & Controlling Terrestrial Plants & Fungi, Logging, Harvesting & Controlling Trees, Fishing, Harvesting & Controlling Aquatic Species
(Land conversion related to tourism growth, poor agricultural and livestock practices, illegal hunting, and fires)
Inside site
, Extent of threat not known
Outside site
No agricultural or livestock activities are permitted in the Sian Ka'an protected area as per the actual legal framework. However, changes in land use outside the World Heritage site have been driven by urban growth related to tourism and, to a lesser extent, by agricultural activities, which together have caused a significant loss of forest cover (IUCN Consultation, 2024).
Some farming groups in the buffer zone engage in illegal hunting for subsistence, which negatively impacts biodiversity. However, the main threat comes from forest fires that these same groups intentionally set (CONANP, 2025). Poachers use fire to clear vegetation from the savannas, creating open areas with tender sprouts that attract animals and make hunting easier. Others use the pib technique—a buried fire used to cook meat—which, when not properly extinguished, can trigger forest fires. Both practices lead to large-scale fires that affect extensive areas of savanna and tropical forest (State Party of Mexico, 2023).
A forest fire prevention strategy has been designed and implemented, which includes the management of dead forest fuels, signage, closure of dusty roads, surveillance using drones, and the construction of watchtowers (State Party of Mexico, 2023). The traditional use of fire by communities surrounding Sian Ka’an—along with the actions of poachers and illegal fishers, land invaders, unauthorized trails and road diversions, combined with natural factors—increases the conservation risk for forested areas within this World Heritage site (CONANP, 2014; Ellis et al., 2015, 2017; State Party of Mexico, 2023). Although a large area within Sian Ka’an is represented by wetlands and the risk of fire is low in these zones, it also includes significant areas of savannah, lowland and medium-sized forests. In these areas, the hummus layer or decomposing organic material in the soil represents a high risk for fire spreading, especially since several years have passed without fires. This characteristic favours the presence of underground fires, which are difficult to combat, in addition to the accumulation of combustible material derived from the trees felled by hurricanes and tropical storms, which in some areas increases the probability of catastrophic fires. Between 2020 and 2024, 24 forest fires were recorded: four in the buffer zone and twenty within the Protected Natural Area, burning a total of 14,622.38 hectares of vegetation (Fire Assessment Sian Ka’an, 2025).
Over the course of 39 years since the establishment of the protected area, a total of 128 forest fires have been recorded in Sian Ka’an and its buffer zone—from 1996 to 2024—all caused by illegal human activities. These fires have affected 42,662.08 hectares, of which 38,323.73 were reported inside the protected area and 4,338.35 in the buffer zone. The fires primarily affected savanna ecosystems (considered fire-adapted), mangrove forests, thorny lowland forest, sub deciduous lowland forest, subevergreen lowland forest, and medium sub evergreen forest (State Party of Mexico, 2023; Fire Assessment Sian Ka’an, 2025). Meanwhile, anthropogenic activities and hydrometeorological phenomena have caused dynamic changes in coastal vegetation and dune ecosystems, impacting both vegetation cover and biodiversity. Despite these impacts, some of the best-preserved areas have shown a degree of recovery, particularly in less-altered ecosystems (Gayosso-Soto et al., 2024).
Some farming groups in the buffer zone engage in illegal hunting for subsistence, which negatively impacts biodiversity. However, the main threat comes from forest fires that these same groups intentionally set (CONANP, 2025). Poachers use fire to clear vegetation from the savannas, creating open areas with tender sprouts that attract animals and make hunting easier. Others use the pib technique—a buried fire used to cook meat—which, when not properly extinguished, can trigger forest fires. Both practices lead to large-scale fires that affect extensive areas of savanna and tropical forest (State Party of Mexico, 2023).
A forest fire prevention strategy has been designed and implemented, which includes the management of dead forest fuels, signage, closure of dusty roads, surveillance using drones, and the construction of watchtowers (State Party of Mexico, 2023). The traditional use of fire by communities surrounding Sian Ka’an—along with the actions of poachers and illegal fishers, land invaders, unauthorized trails and road diversions, combined with natural factors—increases the conservation risk for forested areas within this World Heritage site (CONANP, 2014; Ellis et al., 2015, 2017; State Party of Mexico, 2023). Although a large area within Sian Ka’an is represented by wetlands and the risk of fire is low in these zones, it also includes significant areas of savannah, lowland and medium-sized forests. In these areas, the hummus layer or decomposing organic material in the soil represents a high risk for fire spreading, especially since several years have passed without fires. This characteristic favours the presence of underground fires, which are difficult to combat, in addition to the accumulation of combustible material derived from the trees felled by hurricanes and tropical storms, which in some areas increases the probability of catastrophic fires. Between 2020 and 2024, 24 forest fires were recorded: four in the buffer zone and twenty within the Protected Natural Area, burning a total of 14,622.38 hectares of vegetation (Fire Assessment Sian Ka’an, 2025).
Over the course of 39 years since the establishment of the protected area, a total of 128 forest fires have been recorded in Sian Ka’an and its buffer zone—from 1996 to 2024—all caused by illegal human activities. These fires have affected 42,662.08 hectares, of which 38,323.73 were reported inside the protected area and 4,338.35 in the buffer zone. The fires primarily affected savanna ecosystems (considered fire-adapted), mangrove forests, thorny lowland forest, sub deciduous lowland forest, subevergreen lowland forest, and medium sub evergreen forest (State Party of Mexico, 2023; Fire Assessment Sian Ka’an, 2025). Meanwhile, anthropogenic activities and hydrometeorological phenomena have caused dynamic changes in coastal vegetation and dune ecosystems, impacting both vegetation cover and biodiversity. Despite these impacts, some of the best-preserved areas have shown a degree of recovery, particularly in less-altered ecosystems (Gayosso-Soto et al., 2024).
Changes in Temperature Regimes, Changes in Precipitation & Hydrological Regime
(Impacts of climate change and extreme weather events, particularly hurricanes)
Inside site
, Throughout(>50%)
Outside site
Sian Ka'an is in the impact zone of tropical storms and hurricanes, and with the effects of climate change, the frequency of storms and hurricanes has increased (State Party of Mexico, 2023). The property is exposed to these weather events between the months of July and November, with a higher probability from September onwards, which can have a wide range of impacts on coastal ecosystems (Herrera-Silveira et al., 2022), infrastructure (Salazar, 2001), biodiversity (Jauregi, 1989; Jauregi et al., 1980; Walker et al., 1996; Lugo et al., 2000), and the livelihoods of people who depend on them. Between 1866 and 2024, Sian Ka’an was affected by 30 hydrometeorological events (Historical Hurricane Tracks – noaa.gov) (NOAA, 2002).
The impact of hurricanes causes defoliation and structural damage to trees, including uprooted and broken-canopy trees (Tanner et al., 1991; Everham & Brokaw, 1996), which increases the availability of dead forest fuels and raises the risk of large-scale wildfires in the years following the event. Additionally, hurricanes have been linked to changes in species composition and dominance, although overall diversity tends not to vary significantly (Sánchez-Sánchez & Islebe, 1999).
In the reefs of Sian Ka’an, corals suffer breakage and loss of living tissue, altering their structure (Pérez-Cervantes et al., 2020), and seagrass cover is reduced. Lobster fishing grounds are also affected due to alterations in the seafloor and the loss of fishing gear installed in the bays (Guzmán Escalante, 2019). Likewise, rainfed agricultural plots in the ejidos within the buffer zone experience damage from these events.
In addition, the vulnerability of the coastline to rising sea levels and the intensity of waves has led to erosion and other compromises on the conservation of mangroves, beaches and leave local communities in several risk (Cinco-Castro and Herrera-Silveira, 2020; State Party of Mexico, 2023). The human settlements Punta Allen, Punta Herrero and María Elena are among the sites with the greatest loss of beach due to rising sea levels (State Party of Mexico, 2023). Rising temperatures and droughts are increasing the occurrence and severity of fires (World Heritage Committee, 2013; CONANP, 2014; IPCC, 2014). The decline in coral reef coverage in the region is likely the result of a synergy of several factors, including bleaching events, disease outbreaks, severe hurricane damage, and anthropogenic stressors (Rioja-Nieto and Álvarez-Filip, 2019; Álvarez-Filip et al., 2022).
The impact of hurricanes causes defoliation and structural damage to trees, including uprooted and broken-canopy trees (Tanner et al., 1991; Everham & Brokaw, 1996), which increases the availability of dead forest fuels and raises the risk of large-scale wildfires in the years following the event. Additionally, hurricanes have been linked to changes in species composition and dominance, although overall diversity tends not to vary significantly (Sánchez-Sánchez & Islebe, 1999).
In the reefs of Sian Ka’an, corals suffer breakage and loss of living tissue, altering their structure (Pérez-Cervantes et al., 2020), and seagrass cover is reduced. Lobster fishing grounds are also affected due to alterations in the seafloor and the loss of fishing gear installed in the bays (Guzmán Escalante, 2019). Likewise, rainfed agricultural plots in the ejidos within the buffer zone experience damage from these events.
In addition, the vulnerability of the coastline to rising sea levels and the intensity of waves has led to erosion and other compromises on the conservation of mangroves, beaches and leave local communities in several risk (Cinco-Castro and Herrera-Silveira, 2020; State Party of Mexico, 2023). The human settlements Punta Allen, Punta Herrero and María Elena are among the sites with the greatest loss of beach due to rising sea levels (State Party of Mexico, 2023). Rising temperatures and droughts are increasing the occurrence and severity of fires (World Heritage Committee, 2013; CONANP, 2014; IPCC, 2014). The decline in coral reef coverage in the region is likely the result of a synergy of several factors, including bleaching events, disease outbreaks, severe hurricane damage, and anthropogenic stressors (Rioja-Nieto and Álvarez-Filip, 2019; Álvarez-Filip et al., 2022).
Problematic Native Species, Pathogens
(Massive arrivals of sargassum on coastlines)
Inside site
, Throughout(>50%)
Massive arrivals of sargassum began in 2014 and reached significant peaks in 2015, 2018 and 2019, with devastating effects on marine and coastal ecosystems. According to recent studies, the arrival of these algae has caused the mortality of marine species such as corals, fish and turtles, by blocking sunlight and altering oxygen levels in the water, which seriously affects biodiversity (García-Sánchez et al., 2020). Beaches have suffered accelerated erosion processes due to the accumulation of sargassum (Chávez et al., 2020). In addition, sargassum, when decomposing, releases compounds such as hydrogen sulfide, which generates unpleasant odours and pollutes the air, affecting human health and tourism activities, which are the economic base of the region. Additionally, due to the presences of plastic debris within the sargassum, there were diverse bacteria found in samples, which may be related to Vibrio cholerae and Vibrio vulnificus which can cause diseases (Griffiths, 2023).
There is a fine line between current and potential threats in the marine and coastal environments due to cumulative effects of climate change. The most severe potential threats on land are likely to stem from expected sea level rise, while higher temperatures are likely to increase the presence of invasive species and enhance the probability of more powerful and destructive hurricanes. In the marine environment, increased water temperatures and ocean acidification will eventually lead to a loss of coral reef structures.
Changes in Physical & Chemical Regimes, Changes in Temperature Regimes, Changes in Precipitation & Hydrological Regime
(Ocean acidification, temperature extremes )
Inside site
, Throughout(>50%)
Outside site
Increasing water temperatures and ocean acidification are negatively affecting corals, weakening their calcareous skeletons and contributing to the reduction of biodiversity on reefs. Acidification also impacts other calcifying organisms, such as algae and molluscs, which aggravates the ecological effects by altering the dynamics of food webs and the structure of coral ecosystems (Hoegh-Guldberg et al., 2017; Allison et al., 2021).
Rising ocean temperatures have been observed to increase the incidence of coral bleaching, a phenomenon in which corals lose their zooxanthellae, microorganisms that help them carry out photosynthesis, thus weakening corals and increasing their vulnerability to diseases (Hill and Hoogenboom, 2022). Heron et al. (2017) predict that under the climate warming scenario of RCP8.5, it is predicted that Sian Ka'an will be exposed to severe coral bleaching at least twice per decade after 2025 and after 2033 under RCP4.5. The groundwater recharge in the Yucatan Peninsula is also predicted to decline by 20-23% under RCP4.5 and RCP8.5 scenarios, which would negatively impact the socio-ecological balance of the region (Rodríguez-Huerta et al., 2019).
Rising ocean temperatures have been observed to increase the incidence of coral bleaching, a phenomenon in which corals lose their zooxanthellae, microorganisms that help them carry out photosynthesis, thus weakening corals and increasing their vulnerability to diseases (Hill and Hoogenboom, 2022). Heron et al. (2017) predict that under the climate warming scenario of RCP8.5, it is predicted that Sian Ka'an will be exposed to severe coral bleaching at least twice per decade after 2025 and after 2033 under RCP4.5. The groundwater recharge in the Yucatan Peninsula is also predicted to decline by 20-23% under RCP4.5 and RCP8.5 scenarios, which would negatively impact the socio-ecological balance of the region (Rodríguez-Huerta et al., 2019).
Involvement of stakeholders and rightsholders, including indigenous peoples and local communities, in decision-making processes
A total of 1,500 persons live within the Sian Ka'an Biosphere Reserve, in majority fishermen based in Punta Allen. Good relations have been established with organized groups such as fishing and lobster harvesting cooperatives (Méndez-Medina et al., 2020) and several small-scale tourism operators. Relationships with marginalized and not formally organized residents and resource users continue to be difficult, and they have been generally been left out of management processes (Brenner and Job, 2012). It is estimated that 80% of the population surrounding Sian Ka’an has never visited the protected area due to extreme poverty in this region (Brown et al., 2015).
The dynamics of the tourism industry in the north of the Yucatan Peninsula caused many Mayan people residing in rural villages to migrate to the big cities, often losing their traditions. The tourist activities inside Sian Ka'an are carried out according to a participatory management program, so there are rules and areas of use, which allow sustainable development with direct benefits to local communities (State Party of Mexico, 2023). Some illegal activities among local residents persist, such as poaching.
The dynamics of the tourism industry in the north of the Yucatan Peninsula caused many Mayan people residing in rural villages to migrate to the big cities, often losing their traditions. The tourist activities inside Sian Ka'an are carried out according to a participatory management program, so there are rules and areas of use, which allow sustainable development with direct benefits to local communities (State Party of Mexico, 2023). Some illegal activities among local residents persist, such as poaching.
Legal framework
Sian Ka’an was declared as a Biosphere Reserve by a Presidential decree on 20 January 1986. 99% of its area (528,147.66 ha) is owned by the federal government (CONANP, 2014). It is subject to existing federal legislation for protected areas, including the General Law on Ecological Balance and Environmental Protection (LGEEPA). The legal framework for maintaining the Outstanding Universal Value including conditions of Integrity of the World Heritage property is considered as providing an adequate basis for effective management and protection (State Party of Mexico, 2023). However, given the pressures stemming from tourism and other activity, it is deemed necessary to elaborate a Program of Land Ecological Planning of the zone of influence of the property, which is a key instrument of environmental policy (State Party of Mexico, 2023).
Governance arrangements
Sian Ka'an has a management program which is implemented by federal authorities in coordination with the residents of the site. There are coordinated work programs with other authorities at the federal level such as the National Guard and the Secretariat of the Navy, which collaborate in the protection of the site (State Party of Mexico, 2023). There is direct participation in the management of the property from a number of groups, including local communities and landowners, Indigenous peoples, women, and local authorities (State Party of Mexico, 2023).
Integration into local, regional and national planning systems (including sea/landscape connectivity)
The management of the World Heritage site is partially integrated into planning for the national system of protected areas (CONANP, 2007). While there is good coordination in terms of the contiguous "Arrecifes de Sian Ka'an Biosphere Reserve" and the "Área de Protección de Flora y Fauna Uaymil" (1994, IUCN category VI), coordination with other sectors such as archaeology and culture, and other marine and terrestrial protected areas nearby leaves much room for improvement. Several municipalities in the south of the State of Quintana Roo where the World Heritage property is located have started to develop and/or update their management plans for urban and ecological zoning due to recent coastal development, with consideration given to the guidelines described in the Sian Ka’an management program; however, the application of relevant zoning laws requires further study (IUCN Consultation, 2024).
Boundaries
The boundaries of this World Heritage site were established based on natural borders whenever possible, respecting the topographic uniformity of the Yucatan Peninsula.
The fact that the adjacent Sian Ka’an Reefs Biosphere Reserve is not part of the World Heritage site has begun to be noticed by local stakeholders, creating confusion among some users engaged in tourism activities in that protected area (IUCN consultation, 2025). Currently, there is no formal buffer zone submitted and acknowledged by the World Heritage Committee as part of the property's inscription on the World Heritage List, however it is embedded between two biosphere reserves: the Mexican Caribbean Biosphere Reserve and Sian Ka’an.
Additionally, in the continental portion of Sian Ka’an, there is a functional buffer zone composed of the ejidos José María Morelos, Chunyaxché, Tres Reyes, Felipe Carrillo Puerto, X-Hazil Sur, Andrés Quintana Roo, and El Cafetal (ejidos are a form of land tenure held by rural communities) (State Party of Mexico, 2023). The area named as the "area of influence" in the management program covers 227,043 hectares.
The fact that the adjacent Sian Ka’an Reefs Biosphere Reserve is not part of the World Heritage site has begun to be noticed by local stakeholders, creating confusion among some users engaged in tourism activities in that protected area (IUCN consultation, 2025). Currently, there is no formal buffer zone submitted and acknowledged by the World Heritage Committee as part of the property's inscription on the World Heritage List, however it is embedded between two biosphere reserves: the Mexican Caribbean Biosphere Reserve and Sian Ka’an.
Additionally, in the continental portion of Sian Ka’an, there is a functional buffer zone composed of the ejidos José María Morelos, Chunyaxché, Tres Reyes, Felipe Carrillo Puerto, X-Hazil Sur, Andrés Quintana Roo, and El Cafetal (ejidos are a form of land tenure held by rural communities) (State Party of Mexico, 2023). The area named as the "area of influence" in the management program covers 227,043 hectares.
Overlapping international designations
The Sian Ka'an Biosphere Reserve was recognized under the Man and the Biosphere (MAB) Program of UNESCO in 1986. It was also inscribed on the Ramsar Convention's List of Wetlands of International Importance in 2003. The World Heritage site management authorities also manage these designations/programmes (State Party of Mexico, 2023). WH management is based on a management program last updated in 2014 that covers the "Complex" of the Sian Ka'an Biosphere Reserve (the World Heritage property), the Uaymil Flora and Fauna Protection Area, and the Sian Ka'an Reefs Biosphere Reserve. Activities are coordinated with international and local NGOs, other national and state-level management agencies, and various academic institutions (Con Pro, 2010; CONANP, 2014). The designation of the Sian Ka'an Biosphere Reserve as a World Heritage property brings with it a certain level of stability and privilege in terms of financial and human resources, a clear legal framework, and staff with relevant expertise and experience to manage the site (IUCN Consultation, 2024). However, information on the quality of coordination with the Ramsar designation is lacking.
Implementation of World Heritage Committee decisions and recommendations
Between 2001 and 2004, four State of Conservation Reports on this site were presented to the World Heritage Committee, addressing concerns about urban pressure and its impacts on the site (housing, ground transport infrastructures and tourism). In response, the State Party launched a project to implement an Environmental Land Use system at regional level. More recent World Heritage Committee Decisions only concern the adoption of a retrospective Statement of Outstanding Universal Value (World Heritage Committee, 2013).
Climate action
Given the importance of reducing the effects of climate change on Mexico's ecosystems, as well as contributing to the reduction of greenhouse gases due to the loss of vegetation, the National Commission for Natural Protected Areas (CONANP) developed the Climate Change Strategy for Protected Areas, which allows the incorporation of climate change topics into the policies and actions of the Commission, strengthen the institution's capacities and respond to the commitments established by Mexico (State Party of Mexico, 2023). At present, there is insufficient data available on the contribution of the site to climate action.
Management plan and overall management system
Since its inscription in 1987, this World Heritage site has played a leading role in highlighting the importance of maintaining the connectivity of the different surrounding ecosystems, which is why other natural protected areas around the Biosphere Reserve were established to reinforce this connectivity: the Uaymil Flora and Fauna Protection Area and the Sian Ka'an Reefs Biosphere Reserve. This approach gave rise to the need to address the management of these sites as a unit, called the Sian Ka'an Complex (IUCN Consultation, 2024). This comprehensive approach is essential to ensure the sustainability of natural resources and the conservation of biodiversity through a set of strategies, standards and actions designed to manage these resources effectively. The system seeks to balance environmental protection with the sustainable use of resources, promoting the conservation of ecosystems and species, as well as the well-being of local communities.
The Sian Ka'an World Heritage site is managed by the National Commission for Natural Protected Areas (CONANP). In addition to annual operations plans, management is based on a management program last updated in 2014 that covers the "Complex" of the Sian Ka'an Biosphere Reserve (the World Heritage property), the Uaymil Flora and Fauna Protection Area, and the Sian Ka'an Reefs Biosphere Reserve. Activities are coordinated with international and local NGOs, other national and state-level management agencies, and various academic institutions (Con Pro, 2010; CONANP, 2014).
The Sian Ka'an management program constitutes the guiding instrument of planning and regulation that establishes the activities, actions and basic guidelines for the management and administration of the World Heritage property. It has five specific objectives that encompass actions of protection, management, restoration, knowledge, culture and management. It establishes policies, strategies and programs in order to determine activities and actions aimed at meeting conservation objectives (State Party of Mexico, 2023). The management program incorporates the results of research, administrative experiences and planning instruments developed in recent years and adapts this instrument to the terms of reference that govern the conservation and management actions of CONANP (State Party of Mexico, 2023). The designation of the Sian Ka'an Biosphere Reserve as a World Heritage property brings with it a certain level of stability and privilege in terms of financial and human resources, a clear legal framework, and staff with relevant expertise and experience to manage the site (IUCN Consultation, 2024).
There is generally appropriate coordination between the relevant governmental and non-governmental actors involved in the property's management, including the participation of research organizations, and community participation.
The Sian Ka'an World Heritage site is managed by the National Commission for Natural Protected Areas (CONANP). In addition to annual operations plans, management is based on a management program last updated in 2014 that covers the "Complex" of the Sian Ka'an Biosphere Reserve (the World Heritage property), the Uaymil Flora and Fauna Protection Area, and the Sian Ka'an Reefs Biosphere Reserve. Activities are coordinated with international and local NGOs, other national and state-level management agencies, and various academic institutions (Con Pro, 2010; CONANP, 2014).
The Sian Ka'an management program constitutes the guiding instrument of planning and regulation that establishes the activities, actions and basic guidelines for the management and administration of the World Heritage property. It has five specific objectives that encompass actions of protection, management, restoration, knowledge, culture and management. It establishes policies, strategies and programs in order to determine activities and actions aimed at meeting conservation objectives (State Party of Mexico, 2023). The management program incorporates the results of research, administrative experiences and planning instruments developed in recent years and adapts this instrument to the terms of reference that govern the conservation and management actions of CONANP (State Party of Mexico, 2023). The designation of the Sian Ka'an Biosphere Reserve as a World Heritage property brings with it a certain level of stability and privilege in terms of financial and human resources, a clear legal framework, and staff with relevant expertise and experience to manage the site (IUCN Consultation, 2024).
There is generally appropriate coordination between the relevant governmental and non-governmental actors involved in the property's management, including the participation of research organizations, and community participation.
Law enforcement
There is acceptable capacity and resources to enforce legislation and regulations in the World Heritage property but some deficiencies of enforcement remain (State Party of Mexico, 2023). More human resources, including additional park rangers, are needed to monitor compliance with environmental laws and ensure law enforcement throughout the site. It is also necessary to improve coordination between authorities (State Party of Mexico, 2023; IUCN Consultation, 2024). The current regulatory structure of protected areas in Mexico contributes to coordination challenges among the different involved agencies. The territory within Sian Ka’an is dedicated to the conservation, management and administration of natural resources through CONANP; however, it is under the jurisdiction of four federal agencies. CONAPESCA (National Commission for Aquaculture and Fisheries) is responsible for ensuring compliance with fishing regulations and patrolling the area along with SEMAR (Secretariat of the Navy), which is in charge of supervising navigation in federal waters. In parallel, CONANP park rangers must coordinate with SEMAR and CONAPESCA to control access to resources in the marine areas of the reserve. In addition, CONANP must monitor resources on land in collaboration with PROFEPA (Federal Attorney for Environmental Protection) and the Federal Police.
Although monitoring, surveillance and law enforcement should be coordinated between these four agencies, on-the-ground efforts in Sian Ka’an are limited due to lack of coordination and budget, as well as insufficient capacity building of the staff of these agencies (IUCN Consultation, 2024). The performance of the government agencies responsible for monitoring and enforcing fisheries regulations in Sian Ka’an reveals some gaps in the legal obligations and scope, as well as in the sources of funding and action protocols of each government agency (IUCN Consultation, 2024). In addition, there is a lack of binding mechanisms or mandatory measures for the agencies to fulfil their responsibilities. However, at the local level in Sian Ka’an, governance resides in fishing cooperatives. These have the legal authority to establish access rules among their members, with a certain degree of autonomy from the government. The way in which cooperatives in Sian Ka’an organize their fishing has been studied in different research studies (Méndez-Medina et al., 2020). A general conclusion of these studies is that, at the local level, each cooperative has developed a monitoring system to ensure that all members respect internal rules. Until now, the high degree of functionality of cooperatives in Sian Ka’an has been attributed to their social organization and the fishing techniques they use, which have a low ecological impact. The cooperatives have developed a system of local rights that strengthens them internally. Despite this system of local rights, the adaptive capacity of cooperatives is not only related to the organizational capacity of the individuals who comprise them. Fishermen are part of a governance system forged by a network of collaborative relationships between actors (state agencies, civil society organizations, and cooperatives), which increases the adaptive capacity of the system as a whole (IUCN Consultation, 2024).
Although monitoring, surveillance and law enforcement should be coordinated between these four agencies, on-the-ground efforts in Sian Ka’an are limited due to lack of coordination and budget, as well as insufficient capacity building of the staff of these agencies (IUCN Consultation, 2024). The performance of the government agencies responsible for monitoring and enforcing fisheries regulations in Sian Ka’an reveals some gaps in the legal obligations and scope, as well as in the sources of funding and action protocols of each government agency (IUCN Consultation, 2024). In addition, there is a lack of binding mechanisms or mandatory measures for the agencies to fulfil their responsibilities. However, at the local level in Sian Ka’an, governance resides in fishing cooperatives. These have the legal authority to establish access rules among their members, with a certain degree of autonomy from the government. The way in which cooperatives in Sian Ka’an organize their fishing has been studied in different research studies (Méndez-Medina et al., 2020). A general conclusion of these studies is that, at the local level, each cooperative has developed a monitoring system to ensure that all members respect internal rules. Until now, the high degree of functionality of cooperatives in Sian Ka’an has been attributed to their social organization and the fishing techniques they use, which have a low ecological impact. The cooperatives have developed a system of local rights that strengthens them internally. Despite this system of local rights, the adaptive capacity of cooperatives is not only related to the organizational capacity of the individuals who comprise them. Fishermen are part of a governance system forged by a network of collaborative relationships between actors (state agencies, civil society organizations, and cooperatives), which increases the adaptive capacity of the system as a whole (IUCN Consultation, 2024).
Sustainable finance
The Mexican federal government through CONANP provides resources and staff for basic operation of the site, as well as resources to promote sustainable productive projects in local communities. The site also receives funding from the Mexican Fund for Nature Conservation (FNAP). Both of these funding sources are assured in the medium and long-term (State party of Mexico, 2023). However, since 2019, the overall government financial support to protected areas in Mexico has greatly diminished, as reflected in the dramatic reduction of CONANP's budget. If this support continues dwindling, the managerial, research/monitoring, and law enforcement capacities of the Sian Ka'an site will be affected (IUCN Consultation, 2020). The available budget is considered acceptable but additional human and financial resources are required to fully meet the management needs (State Party of Mexico, 2023). At the national level, additional financial resources dedicated to the management of natural World Heritage properties and the protection of their OUV would be of benefit (IUCN Consultation, 2024).
Despite limited funding, CONANP channels part of its fiscal budget to promote sustainable development projects with local communities through economic subsidy programs such as the Conservation Program for Sustainable Development (PROCODES). This program aims to strengthen sustainable development in protected natural areas and their areas of influence, through the implementation of projects that promote the conservation of biodiversity, while improving the living conditions of local communities, including sustainable productive activities, strengthening of local capacities, conservation and restoration of ecosystems, as well as alternative tourism projects that integrate communities in the management and protection of natural resources (IUCN Consultation, 2024).
Due to its global importance, Sian Ka’an has attracted considerable attention from international NGOs and agencies (GEF/UNDP, GIZ, KfW, NAWCA) that generally support medium-term objectives and activities. These projects promote conservation activities and productive activities undertaken by the inhabitants of the communities. A Trust Fund for protected areas of Quintana Roo State is being developed (Con Pro, 2010; CONANP, 2007), though updated information on this initiative is unavailable.
Despite limited funding, CONANP channels part of its fiscal budget to promote sustainable development projects with local communities through economic subsidy programs such as the Conservation Program for Sustainable Development (PROCODES). This program aims to strengthen sustainable development in protected natural areas and their areas of influence, through the implementation of projects that promote the conservation of biodiversity, while improving the living conditions of local communities, including sustainable productive activities, strengthening of local capacities, conservation and restoration of ecosystems, as well as alternative tourism projects that integrate communities in the management and protection of natural resources (IUCN Consultation, 2024).
Due to its global importance, Sian Ka’an has attracted considerable attention from international NGOs and agencies (GEF/UNDP, GIZ, KfW, NAWCA) that generally support medium-term objectives and activities. These projects promote conservation activities and productive activities undertaken by the inhabitants of the communities. A Trust Fund for protected areas of Quintana Roo State is being developed (Con Pro, 2010; CONANP, 2007), though updated information on this initiative is unavailable.
Staff capacity, training and development
Capacity building for management agencies and personnel is part of the current conservation and management program (Con Pro, 2010; CONANP, 2014). The 2014 management plan aims to increase capacity of administrative and operational personnel without mentioning the priority areas. Staff resources in the fields of conservation and environmental sustainability are recently reported as "good", whereas there is a lack of capacity in areas related to research and monitoring, awareness raising, interpretation, and community participation; however, there are reported good training opportunities available in many management areas (State Party of Mexico, 2023).
Currently, the 90% of the Sian Ka’an staff possess training on fire fighting; around 80% of the staff has some training on law enforcement use of tools and technologies for surveillance; less than 20% of the current staff has training in marine conservation topics (IUCN Consultation, 2025). It is important that all staff members have updated and complete training in these subjects in order to ensure adequate management capacity for the property. At the same time, it is important to emphasize the crucial efforts of the staff that works within the World Heritage site, which is compiled of 90% of the members with more than 15 years of experience in the management of the area, contributing to successful outcomes even with the limited resources (IUCN Consultation, 2024). Sian Ka'an is part of the Marine Program of World Heritage Sites and participated in the elaboration of the guide called "Managing effectively the world’s most iconic Marine Protected Areas". This guide is a primer on how to accomplish effective, pro-active management to ensure the long-term conservation and sustainable development of World Heritage marine sites. It also lays the groundwork toward establishing a common standard for effective management and pro-active decision-making (State Party of Mexico, 2023). Information on the application of this resource within the property is not available.
Currently, the 90% of the Sian Ka’an staff possess training on fire fighting; around 80% of the staff has some training on law enforcement use of tools and technologies for surveillance; less than 20% of the current staff has training in marine conservation topics (IUCN Consultation, 2025). It is important that all staff members have updated and complete training in these subjects in order to ensure adequate management capacity for the property. At the same time, it is important to emphasize the crucial efforts of the staff that works within the World Heritage site, which is compiled of 90% of the members with more than 15 years of experience in the management of the area, contributing to successful outcomes even with the limited resources (IUCN Consultation, 2024). Sian Ka'an is part of the Marine Program of World Heritage Sites and participated in the elaboration of the guide called "Managing effectively the world’s most iconic Marine Protected Areas". This guide is a primer on how to accomplish effective, pro-active management to ensure the long-term conservation and sustainable development of World Heritage marine sites. It also lays the groundwork toward establishing a common standard for effective management and pro-active decision-making (State Party of Mexico, 2023). Information on the application of this resource within the property is not available.
Education and interpretation programmes
There is an environmental education program as part of the current management program and it is currently being updated by site management authorities (IUCN Consultation, 2024). However, the site is understaffed to implement a permanent program of environmental education and outreach (State Party of Mexico, 2023).
Due to the complications arising from the COVID-19 pandemic, the implementation of environmental education programs was severely affected by access to the protected area and group size restrictions. To date, it has not been possible to resume the program at its original pace; however some environmental education efforts continue by giving talks to groups of students visiting the Reserve. There is some dissemination material available, as well as a puppet play that disseminates messages of conservation of the tropical forest and the fauna that inhabits it (IUCN Consultation, 2024; State Party of Mexico, 2023).
Civil society organizations have been responsible for implementing various education and awareness actions (State Party of Mexico, 2023). The NGO "Amigos de Sian Ka’an" runs education programs to raise awareness in conserving the Quintana Roo aquifer, and their work has expanded since 2019 (see Projects).
In addition, CONANP has prioritized, through subsidy programs such as PROREST (Program for the Protection and Restoration of Ecosystems and Priority Species), the formation of monitoring networks, fire management, and community surveillance with the inhabitants of the buffer zone, which contributed to the sensibilisation and awareness raising programme.
Due to the complications arising from the COVID-19 pandemic, the implementation of environmental education programs was severely affected by access to the protected area and group size restrictions. To date, it has not been possible to resume the program at its original pace; however some environmental education efforts continue by giving talks to groups of students visiting the Reserve. There is some dissemination material available, as well as a puppet play that disseminates messages of conservation of the tropical forest and the fauna that inhabits it (IUCN Consultation, 2024; State Party of Mexico, 2023).
Civil society organizations have been responsible for implementing various education and awareness actions (State Party of Mexico, 2023). The NGO "Amigos de Sian Ka’an" runs education programs to raise awareness in conserving the Quintana Roo aquifer, and their work has expanded since 2019 (see Projects).
In addition, CONANP has prioritized, through subsidy programs such as PROREST (Program for the Protection and Restoration of Ecosystems and Priority Species), the formation of monitoring networks, fire management, and community surveillance with the inhabitants of the buffer zone, which contributed to the sensibilisation and awareness raising programme.
Tourism and visitation management
Due to the global increase in travellers seeking experiences in natural environments, and the projected trends in this sector, low environmental impact tourism is presented as a key tool for the sustainable development of the region (IUCN Consultation, 2024). This type of tourism, based on sustainability criteria — ecologically sustainable in the long term, economically viable and socially equitable — seeks to promote the conservation of biodiversity, improve the quality of life of local communities and generate greater opportunities for well-being and development for its residents (CONANP, 2014).
This approach is crucial in areas such as Sian Ka'an, where the protection of natural resources is a priority, while integrating local communities in activities that benefit both the economy and the environment (CONANP, 2014). Collaboration with local communities, conservation authorities and tour operators has generated management strategies that include environmental education for visitors, improvement in tourism infrastructure and the application of good practices to guarantee the long-term preservation of this protected natural area. In Sian Ka'an, various tourist activities are offered such as observation tours of marine flora and fauna aboard small boats, snorkelling in the reef system, trekking, kayaking, flotation in natural water channels and sport fishing of catch and release, this last activity being the one that leaves a greater economic spill in the communities inside the property. The monitoring program of tourist activities provides information on the tourist use of the site. Sian Ka'an's management program includes administrative rules regulating tourism activities, these rules are the result of five studies of carrying capacity and acceptable change limit. The estimation of the tourist carrying capacity depends on the characteristics of the site and the desired conditions for it. In this way, the conditions of greater fragility of the site are expressed in the social and physical limitations to carry out the tourist tours in the system and the desired conditions. Inside the site, authorization from the federal government is required to carry out tourist activities. According to Mexican environmental legislation, only local companies (cooperatives and family businesses) can obtain authorization to carry out tourist activities for profit (State Party of Mexico, 2023).
There are encouraging efforts to establish local tour operators to capture niche markets, in particular from the NGO "Amigos de Sian Ka’an", which aims to brand the Biosphere Reserve as a major eco-tourisim destination (Maya Ka’an), with the support of the Inter-American Development Bank. However, it is necessary to reinforce the monitoring of tourist-recreational activities in order to identify the impacts generated and the real economic spillover within the local communities, so that it is possible to adapt the management strategies in this area and reduce the risks to the conservation of the site, especially considering that Sian Ka'an is currently surrounded by large-scale and resource-intensive tourist infrastructure projects such as the "Tren Maya", the Felipe Carrillo Puerto International Airport and the "Puerta al Mar" Project, which seek to stimulate the local economy through tourism (IUCN Consultation, 2024).
While tourism and visitation within the World Heritage property is managed according to existing management instruments and guidance, the significant impacts presented by poorly controlled tourism growth and infrastructure outside the protected area present serious concerns for the conservation of the property.
This approach is crucial in areas such as Sian Ka'an, where the protection of natural resources is a priority, while integrating local communities in activities that benefit both the economy and the environment (CONANP, 2014). Collaboration with local communities, conservation authorities and tour operators has generated management strategies that include environmental education for visitors, improvement in tourism infrastructure and the application of good practices to guarantee the long-term preservation of this protected natural area. In Sian Ka'an, various tourist activities are offered such as observation tours of marine flora and fauna aboard small boats, snorkelling in the reef system, trekking, kayaking, flotation in natural water channels and sport fishing of catch and release, this last activity being the one that leaves a greater economic spill in the communities inside the property. The monitoring program of tourist activities provides information on the tourist use of the site. Sian Ka'an's management program includes administrative rules regulating tourism activities, these rules are the result of five studies of carrying capacity and acceptable change limit. The estimation of the tourist carrying capacity depends on the characteristics of the site and the desired conditions for it. In this way, the conditions of greater fragility of the site are expressed in the social and physical limitations to carry out the tourist tours in the system and the desired conditions. Inside the site, authorization from the federal government is required to carry out tourist activities. According to Mexican environmental legislation, only local companies (cooperatives and family businesses) can obtain authorization to carry out tourist activities for profit (State Party of Mexico, 2023).
There are encouraging efforts to establish local tour operators to capture niche markets, in particular from the NGO "Amigos de Sian Ka’an", which aims to brand the Biosphere Reserve as a major eco-tourisim destination (Maya Ka’an), with the support of the Inter-American Development Bank. However, it is necessary to reinforce the monitoring of tourist-recreational activities in order to identify the impacts generated and the real economic spillover within the local communities, so that it is possible to adapt the management strategies in this area and reduce the risks to the conservation of the site, especially considering that Sian Ka'an is currently surrounded by large-scale and resource-intensive tourist infrastructure projects such as the "Tren Maya", the Felipe Carrillo Puerto International Airport and the "Puerta al Mar" Project, which seek to stimulate the local economy through tourism (IUCN Consultation, 2024).
While tourism and visitation within the World Heritage property is managed according to existing management instruments and guidance, the significant impacts presented by poorly controlled tourism growth and infrastructure outside the protected area present serious concerns for the conservation of the property.
Sustainable use
Sustainable use is inherent to the concept of a biosphere reserve and is being promoted by multiple management projects and activities (Con Pro, 2010; CONANP, 2007). An example of this is the exploitation of the spiny lobster (Panulirus argus), a fundamental economic activity for three important human settlements in the region: Punta Allen, Punta Herrero and María Elena. In this context, local fishing cooperatives established a sustainable use system that has guaranteed the preservation of the lobster population (CONANP, 2014).
Despite significant progress in managing the spiny lobster, significant challenges remain in the Sian Ka’an Biosphere Reserve. Illegal hunting and unsustainable extraction of non-timber forest resources by some local communities are common activities that generate considerable negative impacts (IUCN Consultation, 2024). These problems require greater inter-institutional and community coordination to be effectively addressed. However, efforts to conserve biodiversity have promoted increasing community participation and collaboration between various actors. Biological monitoring and eradication programs have been implemented for invasive species, such as the casuarina and the lionfish, which represent a threat to native ecosystems. In addition, fishery resource management initiatives have been developed in collaboration with local cooperatives, which have obtained international certifications for their sustainable practices, demonstrating a commitment to conservation and sustainable development in the region (IUCN Consultation, 2024).
It is also important to mention that in the last 10 years there has been an observed increase in the conversion of activities, moving from unsustainable fishing practices (shortcut traps, gillnets) to ecotourism activities such as catch and release fishing, birdwatching and tours with observation of flora and fauna and environmental interpretation (IUCN Conservation, 2024).
Despite significant progress in managing the spiny lobster, significant challenges remain in the Sian Ka’an Biosphere Reserve. Illegal hunting and unsustainable extraction of non-timber forest resources by some local communities are common activities that generate considerable negative impacts (IUCN Consultation, 2024). These problems require greater inter-institutional and community coordination to be effectively addressed. However, efforts to conserve biodiversity have promoted increasing community participation and collaboration between various actors. Biological monitoring and eradication programs have been implemented for invasive species, such as the casuarina and the lionfish, which represent a threat to native ecosystems. In addition, fishery resource management initiatives have been developed in collaboration with local cooperatives, which have obtained international certifications for their sustainable practices, demonstrating a commitment to conservation and sustainable development in the region (IUCN Consultation, 2024).
It is also important to mention that in the last 10 years there has been an observed increase in the conversion of activities, moving from unsustainable fishing practices (shortcut traps, gillnets) to ecotourism activities such as catch and release fishing, birdwatching and tours with observation of flora and fauna and environmental interpretation (IUCN Conservation, 2024).
Monitoring
Recent reporting by the State Party indicate that there is a comprehensive, integrated programme of monitoring, which is relevant to management needs and/or improving understanding of the Outstanding Universal Value (State Party of Mexico, 2023). Information on the values of the World Heritage property is adequate and key indicators have been defined but monitoring of the status of indicators could be improved. Sian Ka'an has a monitoring program that was developed with the methodology of Planning for the Conservation of Areas (PCA), based on conservation objects at the community-ecosystem level (coral reefs, freshwater wetlands, brackish wetlands, tropical forests (low and medium subdeciduous and subperennifolia forests), bays and seagrasses, beaches and coastal dunes), and at the level of population-species (pumas and jaguars). CONANP in coordination with national and international research institutions and civil society organizations implement biological, environmental and social monitoring protocols that generate information on the conservation status of the site. However, it is considered necessary to strengthen social and economic monitoring (State Party of Mexico, 2023).
Monitoring of indicators of threat reduction and the state of conservation targets is on-going in the framework of the 2014 management plan, but to date, data is deficient on the degree to which it has been implemented (Con Pro, 2010; CONANP, 2007).
However, there are efforts to conserve biodiversity through community participation and collaboration with different actors. To this end, biological monitoring and eradication programs for invasive species, such as casuarina and lionfish, have been implemented, as well as fishery resource management initiatives in collaboration with local cooperatives, achieving international certifications for sustainable practices. In addition, CONANP has prioritized, through subsidy programs such as PROREST (Program for the Protection and Restoration of Ecosystems and Priority Species), the formation of monitoring networks, fire management, and community surveillance with the inhabitants of the buffer zone (IUCN Consultation, 2024, 2025). This has made it possible to train the individuals carrying out these activities and to establish groups that support various core functions of the protected area.
Monitoring of indicators of threat reduction and the state of conservation targets is on-going in the framework of the 2014 management plan, but to date, data is deficient on the degree to which it has been implemented (Con Pro, 2010; CONANP, 2007).
However, there are efforts to conserve biodiversity through community participation and collaboration with different actors. To this end, biological monitoring and eradication programs for invasive species, such as casuarina and lionfish, have been implemented, as well as fishery resource management initiatives in collaboration with local cooperatives, achieving international certifications for sustainable practices. In addition, CONANP has prioritized, through subsidy programs such as PROREST (Program for the Protection and Restoration of Ecosystems and Priority Species), the formation of monitoring networks, fire management, and community surveillance with the inhabitants of the buffer zone (IUCN Consultation, 2024, 2025). This has made it possible to train the individuals carrying out these activities and to establish groups that support various core functions of the protected area.
Research
There is a comprehensive, integrated programme of research, which is relevant to management needs and/or improving understanding of Outstanding Universal Value (State Party of Mexico, 2023). Sian Ka'an has developed more than 1,000 scientific publications, developed by more than 80 national and international research institutions. These range from contributions to books, scientific journals, theses, popular literature, book chapters, etc. (State Party of Mexico, 2023).
Considerable research has been undertaken in the Biosphere Reserve on wildlife, terrestrial and marine ecology, geology and hydrology over many years, with an emphasis on its application to management and conservation (IUCN Consultation, 2024). Recently (2019), several scientific and conservation projects by NGOs have begun/expanded in Sian Ka'an and are contributing to the site's management.
The impacts of the massive, seasonal influx of sargassum in the coastal/marine areas of Sian Ka'an needs to be closely monitored and researched. However, up-to-date research on visitor segmentation and visitor spending is scarce. The information generated by the research projects has been used to develop and improve management and conservation strategies for the site. It is necessary to disseminate the results of some research projects with the inhabitants (State Party of Mexico, 2023).
Considerable research has been undertaken in the Biosphere Reserve on wildlife, terrestrial and marine ecology, geology and hydrology over many years, with an emphasis on its application to management and conservation (IUCN Consultation, 2024). Recently (2019), several scientific and conservation projects by NGOs have begun/expanded in Sian Ka'an and are contributing to the site's management.
The impacts of the massive, seasonal influx of sargassum in the coastal/marine areas of Sian Ka'an needs to be closely monitored and researched. However, up-to-date research on visitor segmentation and visitor spending is scarce. The information generated by the research projects has been used to develop and improve management and conservation strategies for the site. It is necessary to disseminate the results of some research projects with the inhabitants (State Party of Mexico, 2023).
Effectiveness of management system and governance in addressing threats outside the site
Sian Ka'an is surrounded by mega-projects such as the "Tren Maya", the Felipe Carrillo Puerto International Airport, and the “Puerta al Mar” project, which are likely to exacerbate the impacts of existing tourism pressures on the property. However, efforts have been made by the management of the World Heritage site and various sections of CONANP in conjunction with neighbouring communities and adjacent landowners to create new protected areas and voluntary conservation areas around Sian Ka'an to continue strengthening conservation and sustainable development actions outside of the property, and thereby reduce the pressure of possible external threats (IUCN Consultation, 2024).
Threats outside the World Heritage site also include those related to deforestation for subsistence agriculture and livestock, these issues are meant to be addressed through the management program (Con Pro, 2010; CONANP, 2014). However, data is deficient on the degree to which these activities have been implemented.
Threats outside the World Heritage site also include those related to deforestation for subsistence agriculture and livestock, these issues are meant to be addressed through the management program (Con Pro, 2010; CONANP, 2014). However, data is deficient on the degree to which these activities have been implemented.
Effectiveness of management system and governance in addressing threats inside the site
Overall, the management system is reported to be fully adequate to maintaining the property's OUV, the management program is being implemented, there is adequate coordination between implicated actors, and there are annual work plans being implemented (State Party of Mexico, 2023). Given the decline in federal government funding for protected areas since 2019, increased resources will help the implementation of the management program, as well as coordinated work with local communities (State Party of Mexico, 2023).
The 2014 management program provides for the application of a management effectiveness evaluation process. To measure such efficiency, the Evaluation of the Effectiveness of the Management of Protected Natural Areas is currently used, with the goal of measuring the effort invested in keeping the area in good condition, both in terms of meeting the purposes for which it was established, and in knowing the effectiveness and efficiency with which human and financial resources are applied. According to the National Report on the Evaluation of the Effectiveness of the Management of Protected Natural Areas of Mexico, Sian Ka'an has an "outstanding" effective management (CONANP, 2019; CONANP, 2021). However, the Mexican government's financial support for protected natural areas has decreased significantly, which has impacted CONANP's operational capacity (García-Tobón et al., 2020).
The 2014 management program provides for the application of a management effectiveness evaluation process. To measure such efficiency, the Evaluation of the Effectiveness of the Management of Protected Natural Areas is currently used, with the goal of measuring the effort invested in keeping the area in good condition, both in terms of meeting the purposes for which it was established, and in knowing the effectiveness and efficiency with which human and financial resources are applied. According to the National Report on the Evaluation of the Effectiveness of the Management of Protected Natural Areas of Mexico, Sian Ka'an has an "outstanding" effective management (CONANP, 2019; CONANP, 2021). However, the Mexican government's financial support for protected natural areas has decreased significantly, which has impacted CONANP's operational capacity (García-Tobón et al., 2020).
The establishment of Sian Ka'an has made a marked difference on a coastline massively transformed since the arrival of mass tourism. At the same time, the site is not immune to the direct and indirect impacts of such broader developments outside the property. However, the challenges are well understood and significant efforts are being undertaking to overcome them. Since 2019, the overall government financial support to protected areas in Mexico has greatly diminished and this affects the overall implementation of management and conservation activities, including capacity of staff for law enforcement, environmental education and awareness, and working on known sustainable use challenges. The growth of urban areas and tourism developments could seriously compromise the property's OUV, and it is necessary to have adequate ecological land planning that gives certainty to the conservation of surrounding ecosystems.
Good practice examples
The exploitation of the spiny lobster (Panulirus argus), a fundamental economic activity for three important human settlements in the region: Punta Allen, Punta Herrero and María Elena. In this context, local fishing cooperatives established a sustainable use system that has guaranteed the preservation of the lobster population. This system works by subdividing the Bahía de la Ascensión into plots or "fields", which in 2016 totalled 251, according to the results of the latest mapping carried out by the protected area. Each field is assigned to a member of the cooperative, who has the exclusive right of use and is responsible for managing his or her plot in a sustainable manner. Their obligations include compliance with fishing regulations and participation in surveillance activities to prevent poaching (Brenner & Vargas, 2010; CONANP, 2014). A photovoltaic system has been installed that generates electricity for the town known as Punta Allen, inside the property of Sian Ka'an. This system is reported to have a positive impact on the property, as it will reduce the use of diesel among the population (State Party of Mexico, 2023).
Scenic mosaic of landscape elements and the relatively undisturbed interface of land and sea along a well-conserved coastline
High Concern
Trend
Deteriorating
While overall there is low concern for the state of natural phenomena, there is high concern with respect to scenic beauty because of uncontrolled coastal development and pollution (Merediz-Alonso et al., 2020; State Party of Mexico, 2023).
The massive seasonal influx of sargassum since 2014, but much more massive since 2018, is becoming a serious threat to the site and its marine/coastal life. This situation needs to be monitored closely (Pérez Ortega et al., 2019).
The massive seasonal influx of sargassum since 2014, but much more massive since 2018, is becoming a serious threat to the site and its marine/coastal life. This situation needs to be monitored closely (Pérez Ortega et al., 2019).
Diversity of ecosystems and range of terrestrial and aquatic life forms
High Concern
Trend
Deteriorating
Overall, there is concern for the state and trend of biological diversity and threatened species, though the rating is somewhat different among conservation targets. The rating for freshwater and brackish water wetlands, bays and seagrass beds, and terrestrial apex predators such as pumas and jaguars is good. There is relatively low concern for tropical forests, while there is high concern for coral reefs, beaches and coastal dunes (State Party of Mexico, 2023; Healthy Reefs for Healthy People, 2012; Con Pro, 2010; CONANP, 2007).
A decline of coral cover has been observed in the broader region and is likely to be the result of a synergy of different drivers including bleaching events coupled with disease outbreaks, severe hurricane damage and anthropogenic stressors (Rioja-Nieto and Álvarez-Filip, 2019; Álvarez-Filip et al., 2022).
Over 39 years since the establishment of the natural protected area, a total of 109 forest fires have been recorded (all caused by illegal human activities), which have affected 37,450 hectares, of which 27,214 are of savanna ecosystems that are considered an ecosystem adapted to fire, 258 hectares of mangrove forest, 2,606 hectares of low thorn forest, 9 hectares of low sub-deciduous forest, 87 hectares of subperenifolia low forest, and 2,665 hectares of medium subperenifolia forest (State Party of Mexico, 2023). However, the use of remote sensing and spectral resolution characteristics favoured the detection of shrub mangroves in relation to other types of wetlands, adding 83,791 hectares of mangrove to Sian Ka'an (Velázquez-Salaza, et al., 2021).
A decline of coral cover has been observed in the broader region and is likely to be the result of a synergy of different drivers including bleaching events coupled with disease outbreaks, severe hurricane damage and anthropogenic stressors (Rioja-Nieto and Álvarez-Filip, 2019; Álvarez-Filip et al., 2022).
Over 39 years since the establishment of the natural protected area, a total of 109 forest fires have been recorded (all caused by illegal human activities), which have affected 37,450 hectares, of which 27,214 are of savanna ecosystems that are considered an ecosystem adapted to fire, 258 hectares of mangrove forest, 2,606 hectares of low thorn forest, 9 hectares of low sub-deciduous forest, 87 hectares of subperenifolia low forest, and 2,665 hectares of medium subperenifolia forest (State Party of Mexico, 2023). However, the use of remote sensing and spectral resolution characteristics favoured the detection of shrub mangroves in relation to other types of wetlands, adding 83,791 hectares of mangrove to Sian Ka'an (Velázquez-Salaza, et al., 2021).
Assessment of the current state and trend of World Heritage values
Deteriorating
Due to its large size and relatively difficult access, large parts of the site continue to be in a good state of conservation. However, there is a concern with respect to the coastal zone, which is affected by uncontrolled development, pollution, and impacts from climate change and severe weather events. Key concerns in terms of overall trends are forest fires, the depletion and contamination of freshwater resources and the uncontrolled use of certain marine and terrestrial species. The massive seasonal influx of sargassum since 2014, but much more massive since 2018, is becoming a serious threat to the site and needs to be monitored closely. A decline of coral cover has been observed in the broader region and is likely to be the result of a synergy of different drivers including bleaching events coupled with disease outbreaks, severe hurricane damage and anthropogenic stressors.
Assessment of the current state and trend of other important biodiversity values
High Concern
Deteriorating
There is a concern with respect to the coastal zone, which is affected by uncontrolled development, pollution, and impacts from climate change and severe weather events. Key concerns in terms of overall trends are forest fires, the depletion and contamination of freshwater resources and the uncontrolled use of certain marine and terrestrial species. The massive seasonal influx of sargassum since 2014, but much more massive since 2018, is becoming a serious threat to the site and needs to be monitored closely. A decline of coral cover has been observed in the broader region and is likely to be the result of a synergy of different drivers including bleaching events coupled with disease outbreaks, severe hurricane damage and anthropogenic stressors. Mangroves, due to their locations on the boundaries between land and sea, form highly sensitive and vulnerable ecosystems. Urban and touristic developments have reduced mangrove areas, while at a larger scale, municipal waste, pesticides and farming fertilizers, and changes in hydrological conditions have impacted the structure and composition of mangrove communities.
Additional information
Provision of jobs,
Tourism-related income
Eco-tourism activities in Sian Kaan generate a significant economic increase contributing to the strengthening of alternative tourism businesses, which, together with lobster fishing, constitutes the main economic income for families living in the protected area; diversifying productive activity, and reducing pressure on the ecosystems of the area (State Party of Mexico, 2023). The monitoring program of tourist activities provides information on the tourist use of the site.
Tourism facilities are growing stressors for the mangroves, dunes and coral reefs.
Importance for research
As a Biosphere Reserve, the site is of great importance for developing and transmitting knowledge of conservation and sustainable use; and the Maya civilization that has been inhabiting and continues to inhabit the area and continues to use the natural resources of the World Heritage site and its surroundings.
Legal subsistence hunting of wild game,
Collection of wild plants and mushrooms,
Fishing areas and conservation of fish stocks
Hosting areas of breeding and reproduction of fishes and crustaceans with commercial relevance, Sian Ka’an is important for the maintenance of local fisheries. Within the area, fishing communities of Punta Allen, Maria Elena and Punta Herrero have rights granted for lobster catch (Palinurus argus). A study indicates that reef-related fisheries in the Mesoamerican Caribbean Reef System, including the Sian Ka'an Biosphere Reserve in Quintana Roo, represent a potential annual value of between US $ 150 and US $ 1,500 per hectare. In peripheral areas, Maya communities engage in small-scale forest and backyard agricultural activities, primarily practicing beekeeping, and some families engage in meliponiculture. For their part, the fishing cooperatives have secured their food supply, as they have diversified their economic activities and no longer depend solely on the extraction of marine resources to sustain their livelihoods. However, the alternative income generated through international programs has been unevenly distributed, disproportionately benefiting a group of approximately 40 families who are members of the first fishing cooperative established in the area in the mid-1980s (GEF).
Carbon sequestration,
Soil stabilisation,
Coastal protection,
Flood prevention,
Water provision (importance for water quantity and quality),
Pollination
Sian Ka'an provides environmental services that are assets of social interest, such as climate regulation, conservation of hydrological cycles, nitrogen fixation, soil formation, carbon sequestration, erosion control, plant pollination, biological pest control, degradation of organic waste and mitigation of the effects of climate change. In addition, the production of food, water, wood, fuels and fibers, among others, depend on the conservation of biodiversity and ecological processes (State Party of Mexico, 2023)
Mangroves provide multiple environmental services but their potential for the sequestration of blue carbon is especially crucial. Blue carbon is key to mitigating the long-term effects of climate change because it is stored in the soil and biomass of coastal marine ecosystems.
Mangroves provide multiple environmental services but their potential for the sequestration of blue carbon is especially crucial. Blue carbon is key to mitigating the long-term effects of climate change because it is stored in the soil and biomass of coastal marine ecosystems.
Due to their locations on the boundaries between land and sea, mangroves form highly sensitive and vulnerable ecosystems. Spatiotemporal mangrove coverage increasingly depends on the multiple and cumulative impacts that are characteristic of the coastal zone. Thus, in the local context, urban and touristic developments have reduced mangrove areas, while at a larger scale, municipal waste, pesticides and farming fertilizers, and changes in hydrological conditions have impacted the structure and composition of mangrove communities.
At the national and global levels, the most valued benefits of Sian Ka'an are conservation and the generation of knowledge, while at the local level the site is most valued as a provider of livelihoods for local communities and a key resource for tourism development. However, other benefits have been undervalued, and more information is needed.
| № | Organization | Brief description of Active Projects | Website |
|---|---|---|---|
| 1 | The Nature Conservancy, The Gillette Company, the United Nations Foundation and Amigos de Sian Ka’an (ASK) | Together these organizations are developing a project to protect critically important wetlands in the Sian Ka’an World Heritage site. The project is implemented by Mexican conservation organization Amigos de Sian Ka’an, which seeks to promote the protection of critical coastal habitats and ensure the viability of the region’s freshwater system by: • Implementing an easement and conservation land buyer program targeting the coastal areas of the Reserve; • Promoting the implementation of the existing land use and zoning plan with landowners and government agencies; • Enabling the acquisition of a key tract of land that strategically protects the only access to an extensive wetland system; • Mapping priority water catchment areas important to the Sian Ka’an wetlands and analyzing sources of contamination in freshwater system; • Promoting best practices for wastewater management to communities, local hotels, and property owners. | |
| 2 | The Nature Conservancy and Amigos de Sian Ka’an (ASK) | These organizations are undertaking a project to address the growing threat of development outside the Reserve, the Conservancy and ASK have engaged the private sector, working with local landowners to establish conservation easements and acquire critically threatened, privately owned lands. The Conservancy and ASK are also working with local communities in and around the Reserve to promote sustainable resource use and best practices for land use and development |
http://www.nature.org/ourinitiatives ;
http://www.amigosdesiankaan.org/es/
|
| 3 | UNDP/GEF/SGP/COMPACT | Sian Ka'an is one of several global sites supported by a specialized programme under the GEF Small Grants Programme named COMPACT. COMPACT is implemented by UNDP and focuses on landscape approaches working with community-based organizations on the ground. | |
| 4 | Cooperative Society of Fishing Production Cozumel | Program for the control and eradication of lionfish in the Sian Ka'an Biosphere Reserve. | |
| 5 | Amigos de Sian Ka'an | Building sustainable recreational experiences in the Sian Ka'an Biosphere Reserve and its surrounding areas. |
http://www.amigosdesiankaan.org/es/
|
| 6 | El Colegio de la Frontera Sur - Chetumal | Through regular aerial monitoring, information about the biology and ecology of the manatees (Trichechus manatus) in Quintana Roo will be updated, focusing mostly on spatial distribution, population size and coastal movements. Threats to the population stemming from growing tourist and marine developments along the coastal zone will be assessed, particularly at sites historically used by manatees (coves and cenotes). Twelve manatees will be captured and tagged with high-precision GPS transmitters along the coastal zone of the Protected Areas of Yum Balam, Sian Ka´an, Xcalak Reef National Park and the Manatee Sanctuary at Bahía de Chetumal. To help promote cooperation with local communities and the authorities responsible for coordinating the protected areas (CONANP), organized local groups, fishing cooperatives and institutions dedicated to manatee conservation will be involved in the capture and monitoring of the tagged manatees. At the end of the project, we will have baseline data regarding the abundance, spatial distribution and movements of manatees along the coastal zone of Quintana Roo, based on which we will be able to recommend preventive measures to help protect manatees and their habitat in Quintana Roo. |
https://www.ecosur.mx/unidad/chetumal/
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| 7 | Amigos de Sian Ka'an | Maya Ka’an is the latest tourism destination in Quintana Roo. Its appeal is based on the cultural and natural wealth of this Mayan area, and it has been designed to directly benefit local communities by protecting natural resources. Maya Ka’an is home to the Sian Ka’an Biosphere Reserve, which is a UNESCO World Heritage Site, and the Sian Ka’an – Calakmul biological corridor. As part of this project, a sustainability model for tourism and community practices will be designed and implemented through sustainable management, environmental awareness and water monitoring initiatives. To achieve this, technologies will be implemented to manage water resources in 22 communities in Maya Ka’an; the Eres Agua, Toma Conciencia education program will be offered to schools in Maya Ka’an and Playa del Carmen; cenote owners and users will be offered training in best conservation practices for the use of cenotes and their caves along the Yucatán Peninsula; and students from Mayan schools in Maya Ka’an and Playa del Carmen will receive training and equipment to monitor water quality in the wells and cenotes located in their communities. |
https://www.amigosdesiankaan.org/en
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| 8 | Comunidad y Biodiversidad, AC | Fishing communities along the Mesoamerican Reef System contribute to the sustainability of Mexico’s fisheries. For example, 245 tons (with a value of USD $4,400,000) of lobster (Panulirus argus) are fished every year by 6 cooperatives located in the central-southern region of the state of Quintana Roo. These cooperatives are considered by international standards to be sustainable. The fishing of Caribbean grouper (Epinephelus striatus), once a major source of income, has declined, and it is now an endangered species. Since 2012, as part of a conservation and management strategy, these 6 cooperatives have been pioneers in using fishing sanctuaries to protect coral reefs and reproductive groups of groupers. Despite these efforts, local and global short- and long-term changes are affecting these resources and communities. Through this project, COBI, in conjunction with 254 fishermen from these 6 cooperatives, will take part in citizen science programs through the monitoring of this coral reef ecosystem, in addition to understanding social and ecological connections through the use of cutting-edge technology to help them adapt to the environmental and social challenges they face. By the end of the project, 75 fishermen will have compiled data regarding the socio-ecological connectivity of two of the region’s most important species (lobster and grouper), 45 fishermen and women will have monitored 16 fishing sanctuaries and 10 commercial fishing spawning grounds, and the fishing communities will have co-designed strategies to adapt to environmental changes (e.g., how to adapt to the seasonal influx of sargassum and climate change) to help ensure sustainable fishing. Seven protected natural areas will be created: the Cozumel Island Flora and Fauna Protection Area, the Cozumel and Xcalak Reef Parks, and the Sian Ka´an Biosphere and Sian Ka´an, Banco Chinchorro and Gran Caribe Mexicano Reef Reserves. This project will contribute to the management programs for these protected natural areas and the management plans for the spiny lobster and grouper in the Yucatán Peninsula. |
https://cobi.org.mx/
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| 9 | IUCN, commissioned by Federal Ministry for Economic Cooperation and Development (BMZ) | The project Mexican Caribbean and Maya Forest Biodiversity I was developed, and a second phase of the Maya Forest component is about to begin, funded by the same organizations. The mission of the project is to position the Maya Forest as a model for conservation and sustainable use of its resources, while ensuring the well-being of its inhabitants and the integrity of its ecosystems. Its vision is that, by 2030, the region will be consolidated as one with a unique natural and cultural identity, where its ecological and historical values are comprehensively preserved, providing environmental services of global significance. |
https://www.kfw-entwicklungsbank.de/Partner-countries/Latin-America-and-the-Caribbean/Project-information-central-america-Selva-Maya/
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